Molecular sieve scm-15, synthesis method therefor and use thereof

ABSTRACT

The invention relates to a molecular sieve SCM-15, a preparation process and use thereof. The molecular sieve comprises a schematic chemical composition of a formula of “SiO2.GeO2”, wherein the molar ratio of silicon and germanium satisfies SiO2/GeO2≥1. The molecular sieve has unique XRD diffraction data and can be used as an adsorbent or a catalyst.

TECHNICAL FIELD

The invention relates to a molecular sieve SCM-15, a process ofpreparing same and use thereof.

BACKGROUND

In industry, porous inorganic materials are widely used as catalysts andcatalyst supports. A porous material has a relatively high specificsurface and an open channel structure, and is therefore a good catalyticmaterial or catalyst support. The porous material may generallycomprise: amorphous porous materials, crystalline molecular sieves,modified layered materials, and the like. The subtle differences in thestructures of these materials are indicatives of significant differencesin their catalytic and adsorption properties, as well as differences inthe various observable properties used to characterize them, such as themorphology, specific surface area, porosity and variability of thesedimensions.

The basic skeleton structure of crystalline microporous zeolite is basedon a rigid three-dimensional TO₄ (SiO₄, AlO₄, etc.) unit structure; inwhich structure, TO₄ shares oxygen atoms in a tetrahedral structure, andthe charge balance of the skeleton tetrahedron, such as AlO₄, ismaintained through the presence of surface cations such as Na⁺ and H₊.It can be seen that the properties of the zeolite can be altered bycation exchange. At the same time, there exists abundant pores withuniform opening in the structure of a zeolite. These pores areinterlaced to form a three-dimensional network structure, and theskeleton can still be stably retained after the removal of the occludedwater or organic species (U.S. Pat. No. 4,439,409). Based on the abovestructure, zeolite not only has good catalytic activity, excellentshape-selection, but also has good selectivity by modification (U.S.Pat. Nos. 6,162,416, 4,954,325, and 5,362,697) in various organicreactions.

The specific structure of a molecular sieve is determined by an X-raydiffraction spectrum (XRD), and the X-ray diffraction spectrum (XRD) ismeasured by an X-ray powder diffractometer using a Cu-Kα ray source witha nickel filter. Different zeolite molecular sieves have different XRDspectrums. Known molecular sieves, such as zeolite A (U.S. Pat. No.2,882,243), zeolite Y (U.S. Pat. No. 3,130,007), PSH-3 molecular sieve(U.S. Pat. No. 4,439,409), ZSM-11 molecular sieve (U.S. Pat. No.3,709,979), ZSM-12 molecular sieve (U.S. Pat. No. 3,832,449), ZSM-23molecular sieve (U.S. Pat. No. 4,076,842), ZSM-35 molecular sieve (U.S.Pat. No. 4,016,245), MCM-22 molecular sieve (U.S. Pat. No. 4,954,325),etc. each have XRD spectra of their respective characteristics.

At the same time, zeolites with same characteristic XRD spectrum butdifferent types of skeleton atoms will be considered as differentmolecular sieves. For example, TS-1 molecular sieve (U.S. Pat. No.4,410,501) and ZSM-5 molecular sieve (U.S. Pat. No. 3,702,886) have thesame characteristic XRD spectrums, but have different skeleton elements.Specifically, the TS-1 molecular sieve comprises skeleton elements of Siand Ti, exhibiting a catalytic oxidation ability, while the ZSM-5molecular sieve comprises skeleton elements of Si and Al, exhibiting anacidic catalytic ability.

In addition, molecular sieves with the same characteristic XRD spectrumand the same types of skeleton elements but with different relativeamounts of the skeleton elements, will be identified as differentmolecular sieves as well. For example, X zeolite (U.S. Pat. No.2,882,244) and Y zeolite (U.S. Pat. No. 3,130,007), share the samecharacterizing XRD pattern and the same types of skeleton elements (Siand Al), but with different relative amounts of Si and Al. Specifically,X zeolite has a Si/Al molar ratio of less than 1.5, while Y zeolite hasa Si/Al molar ratio of higher than 1.5.

SUMMARY OF THE INVENTION

The inventors have made deep study on the basis of the prior art andfound a novel molecular sieve SCM-15, and further identified beneficialproperties thereof.

Specifically, the present invention relates to a molecular sieve SCM-15,characterized in that the molecular sieve has an X-ray diffractionspectrum as substantially shown in the table below.

2θ (°) ^((a)) d-distance (Å) Relative intensity (I/I₀ × 100) 4.81118.424 ± 1.148 w 6.571 13.468 ± 0.614 m-vs 6.888 12.847 ± 0.559 m-s9.675  9.143 ± 0.283 m-vs 9.894  8.941 ± 0.270 m-vs 19.888  4.462 ±0.067 w-m ^((a)) = ±0.3°.

The present invention also provides a process of preparing the molecularsieve SCM-15.

Technical Effect

According to the present invention, the SCM-15 molecular sieve involvedhas a skeleton structure which has never been obtained before in theart.

DESCRIPTION OF DRAWINGS

FIG. 1 is an X-ray diffraction spectrum (XRD) of the molecular sieve (inthe prepared form) obtained in Example 1.

FIG. 2 is an X-ray diffraction spectrum (XRD) of the molecular sieve (inthe prepared form) obtained in Example 8.

FIG. 3 is an X-ray diffraction spectrum (XRD) of the molecular sieve (inthe calcined form) obtained in Example 8.

EMBODIMENTS

The embodiments of the present invention will be illustrated in detailbelow, while it should be understood that the protection scopes of thepresent invention are no restricted thereto; instead, the protectionscopes are defined by the claims attached.

All publications, patent applications, patents and other referencesmentioned in this specification are hereby incorporated by reference.Unless otherwise defined, the scientific and technical terms used in thespecification have the meanings conventionally known by those skilled inthe art. For conflicting meanings of the terms, they shall be understoodby the definitions of the present specification.

When the present specification mentions a material, substance, method,step, device, or component, etc. with the derivative words “known tothose skilled in the art”, “prior art” or the like, the term derived isintended to cover those conventionally used in the field of the presentapplication, but also cover those that are not currently known, whilstwill become known in the art to be useful for the similar purposes.

In the context of this specification, the term “specific surface area”refers to the total area of a unit weight of sample, including theinternal surface area and the external surface area. Non-porous sampleshave only external surface areas, such as silicate cement, some claymineral particles, etc.; while porous samples have both external andinternal surface areas, such as asbestos fibers, diatomaceous earth andmolecular sieves. The surface area of pores having pore diameters lessthan 2 nm in a porous sample is the internal surface area, the surfacearea after deducting the internal surface area from the total surfacearea is referred to as the external surface area, and the externalsurface area per unit weight of a sample is the external specificsurface area.

In the context of this specification, the term “pore volume” refers tothe volume of pores per unit weight of porous material. The term “totalpore volume” refers to the volume of all pores (generally only the poreshaving a pore diameter of less than 50 nm) per unit weight of molecularsieve. The term “micropore volume” refers to the volume of allmicropores (generally the pores having a pore diameter of less than 2nm) per unit weight of molecular sieve.

In the context of the present specification, in the XRD data of amolecular sieve, w, m, s, and vs represent the intensities of thediffraction peaks, wherein w represents weak, m represents medium, srepresents strong, and vs represents very strong, which are known tothose skilled in the art. In general, w is less than 20; m is 20-40; sis 40-70; and vs is greater than 70.

In the context of the present specification, the structure of amolecular sieve is determined by X-ray diffraction (XRD), wherein theX-ray diffraction spectrum (XRD) of the molecular sieve is collectedusing an X-ray powder diffractometer equipped with a Cu-Kα ray source,with Kα1 wavelength λ=1.5405980 angstroms (Å) and a nickel filter.

In the context of the present specification, the so-called preparedstate, prepared form or prepared molecular sieve refers to the state ofthe molecular sieve after the completion of the preparation. As theprepared state, a specific example may be the state directly presentedafter completion of the preparation (generally called as a precursor ofmolecular sieve), or a state after organic substances (particularly, anorganic template agent) which may be present in the pores of themolecular sieve precursor are further removed by a method other thancalcination. Thus, in the prepared state, the molecular sieve maycontain water, may contain organic substances, or may be free of wateror organic substances.

In the context of this specification, the term “calcined”, “calcinedform” or “calcined molecular sieve” refers to the state of the molecularsieve after calcination. As the state after calcination, for example,may be a state obtained by further removing organic substances(particularly, organic template agents) and water, etc. that may bepresent in the pores of the prepared molecular sieve by calcination.Here, the conditions of the calcination include, in particular:calcinating at 550° C. for 6 hours in an air atmosphere.

It should be particularly understood that two or more of the aspects (orembodiments) disclosed in the context of this specification can becombined with each other as desired, and that such combined embodiments(e.g., methods or systems) are incorporated herein and constitute a partof this original disclosure, while remaining within the scope of thepresent invention.

Without otherwise specifically indicated, all percentages, parts,ratios, etc. mentioned in this specification are provided by weight,unless the basis by weight is not in accordance with the conventionalknowledge of those skilled in the art.

According to an aspect of the present invention, the invention relatesto molecular sieve SCM-15. The molecular sieve, particularly in itsprepared form or calcined form, has an X-ray diffraction spectrumsubstantially as shown in Table A-1 or Table A-2 below.

TABLE A-1 2θ (°) ^((a)) d-distance (Å) ^((b)) Relative intensity (I/I₀ ×100) 4.811 18.353 w 6.571 13.441 m-vs 6.888 12.823 m-s 9.675 9.134 m-vs9.894 8.933 m-vs 19.888 4.461 w-m ^((a)) = ±0.3°, ^((b)) is a functionof 2θ.

TABLE A-2 2θ (°) ^((a)) d-distance (Å) Relative intensity (I/I₀ × 100)4.811 18.424 ± 1.148 w 6.571 13.468 ± 0.614 m-vs 6.888 12.847 ± 0.559m-s 9.675  9.143 ± 0.283 m-vs 9.894  8.941 ± 0.270 m-vs 19.888  4.462 ±0.067 w-m ^((a)) = ±0.3°.

According to an aspect of the present invention, the X-ray diffractionspectrum may further comprise X-ray diffraction peaks substantially asshown in Table B-1 or Table B-2 below.

TABLE B-1 2θ (°) ^((a)) d-distance (Å) ^((b)) Relative intensity (I/I₀ ×100) 8.225 10.741 w 15.592 5.679 w 22.031 4.031 w-m 22.435 3.960 w-m25.330 3.513 w ^((a)) = ±0.3°, ^((b)) is a function of 2θ.

TABLE B-2 2θ (°)^((a)) d-distance (Å) ^((b)) Relative intensity (I/I₀ ×100) 8.225 10.755 ± 0.392  w 15.592 5.681 ± 0.109 w 22.031 4.032 ± 0.054w-m 22.435 3.960 ± 0.052 w-m 25.330 3.514 ± 0.041 w ^((a))= ±0.3°.

According to an aspect of the present invention, the X-ray diffractionspectrum optionally further comprises X-ray diffraction peakssubstantially as shown in the following Table.

2θ (°)^((a)) d-distance (Å) ^((b)) Relative intensity (I/I₀ × 100)14.294 6.194 ± 0.129  w 16.909 5.241 ± 0.0.092 w 19.156 4.630 ± 0.0.072w-m 19.517 4.546 ± 0.0.069 w-m 21.162 4.196 ± 0.0.059 w-m ^((a))= ±0.3°.

According to an aspect of the present invention, the molecular sieveSCM-15 has a schematic chemical composition as shown with the formula“SiO₂.GeO₂”. It is known that molecular sieves sometimes contain acertain amount of moisture and organics (especially organic templateagents), particularly immediately after preparation, but it is notconsidered necessary to specify the amount of the moisture and organicsin the present invention because the presence or absence of thismoisture and organics does not substantially affect the XRD spectrum ofthe molecular sieve. In view of this, the schematic chemical compositionrepresents in fact the chemical composition of the molecular sieveexcluding water and organics. Moreover, it is apparent that theschematic chemical composition represents the framework chemicalcomposition of the SCM-15 molecular sieve, or alternatively, mayrepresent the schematic chemical composition of the calcined SCM-15molecular sieve.

According to an aspect of the invention, in the molecular sieve SCM-15,the molar ratio of silicon to germanium satisfies SiO₂/GeO₂≥1,preferably 1≤SiO₂/GeO₂≤15, preferably SiO₂/GeO₂≤10, more preferably2.5≤SiO₂/GeO₂≤5.

According to an aspect of the invention, in the molecular sieve SCM-15,germanium on the sekeleton may be partially replaced by a trivalent ortetravalent element other than silicon and germanium, with a replacementratio not exceeding 10%. Here, the parameter “replacement ratio” isdimensionless. When germanium is replaced by a trivalent element, suchas boron or aluminum, the replacement ratio=2X₂O₃/(2X₂O₃+GeO₂)×100%,wherein X is a trivalent element. When germanium is replaced by atetravalent element, such as tin, zirconium, or titanium, thereplacement ratio=YO₂/(YO₂+GeO₂)×100%, wherein Y is a tetravalentelement. In calculating the replacement ratio, the moles of thecorresponding oxide are used.

According to an aspect of the invention, the molecular sieve SCM-15 hasa specific surface area (according to BET method) of 100-600 m²/g,preferably 130-500 m²/g, more preferably 200-400 m²/g.

According to an aspect of the invention, the molecular sieve SCM-15 hasa micropore volume (according to t-plot method) of 0.04-0.25 cm³/g,preferably 0.05-0.20 cm³/g, more preferably 0.09-0.18 cm³/g.

According to an aspect of the present invention, the molecular sieveSCM-15 can be prepared by the following processes. In view of this, thepresent invention also relates to a process of preparing a molecularsieve SCM-15, comprising the step of: crystallizing a mixture(hereinafter called as mixture) comprising or formed from a siliconsource, a germanium source, a fluorine source, an organic template agentand water, to obtain said molecular sieve.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the organic template agent is selectedfrom 4-pyrrolidinyl pyridine, or a quaternary ammonium form representedby formula (A-1), formula (A-2) or formula (A-3), preferably4-pyrrolidinyl pyridine. These organic Template agents may be used aloneor as a combination in a desired ratio.

In each formula, R₁ and R₂ are each independently H or C₁₋₈ alkyl,preferably C₁₋₄ alkyl, more preferably C₁₋₂ alkyl, and X⁻ are eachindependently a halogen ion (such as Cl⁻, Br⁻, and I⁻) and a hydroxideion (OH⁻), preferably hydroxide ion (OH⁻).

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the crystallization step may be performedin any manner conventionally known in the art, such as a method ofmixing the silicon source, the germanium source, the fluorine source,the organic template agent and water in a given ratio, andhydrothermally crystallizing the obtained mixture under thecrystallization conditions. Stirring may be applied as required.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, any silicon source conventionally used inthe art for this purpose may be used as the silicon source. Examplesthereof include silicic acid, silica gel, silica sol, tetraalkylorthosilicate, and water glass. These silicon sources may be used aloneor as a combination in a desired ratio.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, any germanium source conventionally usedin the art for this purpose may be used as the germanium source,including but not limited to germanium oxide, germanium nitrate, andtetraalkoxy germanium.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, any fluorine source conventionally usedfor this purpose in the art may be used as the fluorine source, andexamples thereof include fluoride or an aqueous solution thereof,particularly hydrofluoric acid and the like.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the molar ratio of the silicon source(calculated as SiO₂), the germanium source (calculated as GeO₂), thefluorine source (calculated as F), the organic template agent and wateris generally from 1:(0-1):(0.1-2.0):(0.1-2.0):(3-30); preferably 1:(1/15-1.5):(0.2-1.5):(0.2-1.5):(4-25); more preferably1:(0.1-0.5):(0.4-1.2):(0.4-1.2):(5-20); more preferably1:(0.2-0.4):(0.6-1.0):(0.6-1.0):(5-15).

According to an aspect of the invention, in the process of preparing themolecular sieve, the crystallization conditions include: acrystallization temperature of 131-210° C., preferably 150-190° C., morepreferably 160-180° C.; and a crystallization duration of 1-20 days,preferably 2-10 days, more preferably 2-7 days.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, an ageing step before crystallization isincluded, and the ageing conditions include: an ageing temperature of50-90° C., and an ageing duration of 2 hours to 2 days.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, when germanium atoms are replaced withtrivalent or tetravalent elements other than silicon and germanium, asource of the trivalent or tetravalent elements other than silicon andgermanium, preferably a source of oxide of the trivalent or tetravalentelements other than silicon and germanium, is added to the mixture. Asthe source of oxide, at least one selected from the group consisting ofa boron oxide source, an aluminum oxide source, a tin oxide source, azirconium oxide source, and a titanium oxide source is preferable.Specific examples of the aluminum oxide source include at least oneselected from the group consisting of aluminum hydroxide, sodiumaluminate, aluminum salt, kaolin and montmorillonite. Specific examplesof the boron oxide source include at least one selected from the groupconsisting of boron oxide, borax, sodium metaborate, and boric acid.Specific examples of the tin oxide source include at least one selectedfrom the group consisting of tin tetrachloride, stannous chloride, alkyltin, alkoxy tin, and organic stannates. Specific examples of thezirconia source include at least one selected from the group consistingof zirconium salts (e.g., zirconium nitrate or zirconium sulfate), alkylzirconium, alkoxy zirconium, and organic zirconates. Specific examplesof the titanium oxide source include one or more selected fromtetraalkyl titanates (e.g., tetramethyl titanate, tetraethyl titanate,tetrapropyl titanate, tetra-n-butyl titanate), TiCl₄, hexafluorotitanicacid, Ti(SO₄)₂, and hydrolysis products thereof.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the molar ratio of the oxide source(calculated as the corresponding oxide) to the germanium source(calculated as GeO₂) when used is generally (0.01-0.1): 1, preferably(0.02-0.08): 1.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, after the crystallization is completed,the molecular sieve can be separated as a product from the obtainedreaction mixture by any separation methods conventionally known, therebyobtaining the molecular sieve SCM-15, which is also called as preparedform of molecular sieve SCM-15. The separation method includes, forexample, a method of filtering, washing and drying the obtained reactionmixture.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the filtering, washing and drying may beperformed by any method conventionally known in the art. Specifically,for example, the reaction mixture obtained may be simply filtered bysuction. Examples of the washing include washing with deionized water.The drying temperature is, for example, 40 to 250° C., preferably 60 to150° C., and the drying duration is, for example, 8 to 30 hours,preferably 10 to 20 hours. The drying may be carried out under normalpressure or under reduced pressure.

According to an aspect of the invention, in the process of preparing themolecular sieve, the molecular sieve SCM-15 may not be calcined.Nevertheless, if needed, organics (particularly the organic templateagent) possibly existing in the molecular sieve can be removed by aUV/ozone method, thereby obtaining an organic-free molecular sieve. Suchmolecular sieve also belongs to the molecular sieve SCM-15 according tothe present invention, which is also called as the prepared form ofmolecular sieve SCM-15. The UV/ozone method is known in the art, and aspecific example thereof comprises placing a molecular sieve at adistance of 2 to 3 mm from an ultraviolet lamp, irradiating themolecular sieve for 12 to 48 hours with ultraviolet light having awavelength of 184 to 257 nm. The ultraviolet light can be generated by alow-pressure mercury lamp or a medium-pressure mercury lamp (10-20mW·cm⁻²) sealed in a box.

According to an aspect of the present invention, in the process ofpreparing the molecular sieve, the molecular sieve obtained bycrystallization may also be calcined, as needed, to remove the organictemplate agent and if any, the water, etc., and thus to obtain thecalcined molecular sieve, which is also called as calcined form ofmolecular sieve SCM-15. The calcination may be carried out in any mannerconventionally known in the art, for example, the calcinationtemperature is generally 300 to 750° C., preferably 400 to 600° C., andthe calcination duration is generally 1 to 10 hours, preferably 3 to 6hours. In addition, the calcination is generally carried out in anoxygen-containing atmosphere, such as air or oxygen atmosphere.

According to an aspect of the present invention, the molecular sieveSCM-15 may be in any physical form, such as a powder, granule, or moldedarticle (e.g., a bar, clover, etc.). These physical forms can beobtained in any manner conventionally known in the art and are notparticularly limited.

According to an aspect of the present invention, the molecular sieveSCM-15 may be used in combination with other materials, therebyobtaining a molecular sieve composition. Examples of the other materialsinclude active materials and inactive materials. Examples of the activematerial include synthetic zeolite and natural zeolite, and examples ofthe inactive material (generally called as a binder) include clay,carclazyte, and alumina. These other materials may be used alone or as acombination in any ratio. The amounts of the other materials can referto those conventionally used in the art, without particular limitation.

According to an aspect of the present invention, the molecular sieveSCM-15 or the molecular sieve composition may be used as an adsorbent,for example to separate at least one component from a mixture of aplurality of components in the gas or liquid phase. Thus, at least onecomponent may be partially or substantially completely separated fromthe mixture of the plurality of components by contacting the mixturewith said molecular sieve SCM-15 or said molecular sieve composition, soas to selectively adsorb such a component.

According to an aspect of the present invention, the molecular sieveSCM-15 or the molecular sieve composition may also be used as a catalyst(or as a catalytically active component thereof) either directly orafter having been subjected to necessary treatments or conversions (suchas ion exchange, etc.) conventionally performed in the art for molecularsieves. To this end, according to an aspect of the present invention, itis possible, for example, to subject a reactant (such as a hydrocarbon)to a given reaction in the presence of the catalyst, and thereby obtaina target product.

EXAMPLES

The present invention will be described in further detail with referenceto examples, whilst the present invention is not limited to theseexamples.

Example 1

43.2 g of deionized water, 42.63 g of organic template agent of4-pyrrolidinylpyridine (98 wt %), 8.37 g of germanium oxide (99 wt %),14.0 g of hydrofluoric acid (40 wt %) and 60.0 g of silica sol (SiO₂ 40wt %) were uniformly mixed to obtain a reaction mixture, wherein thematerial ratios (molar ratios) of the reaction mixture were as follows:

SiO₂/GeO₂=5

Template agent/SiO₂=0.70

F/SiO₂=0.70

H₂O/SiO₂=12

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for aging in a 80° C. water bath for 2 hours, and thencrystallizing at 170° C. for 5 days under stirring. Aftercrystallization, the solution was filtered, washed and dried at 120° C.for 12 hours to obtain a molecular sieve.

The XRD spectrum data of the molecular sieve (in the prepared form) ofthe product was shown in Table 1, and the XRD spectrum was shown in FIG.1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=5.1.

TABLE 1 2 θ/° d/Å I/I₀ 100 4.829 18.2824 2.4 6.594 13.393 65.4 6.88912.8198 32 8.234 10.7289 13.6 9.691 9.1187 77.1 9.892 8.9341 100 10.2968.5844 1 11.89 7.4371 1.2 13.147 6.7288 4.4 13.5 6.5536 2.4 14.2156.2255 2.3 15.613 5.671 8.4 16.084 5.5059 1.4 16.541 5.355 6.2 16.9315.2324 9.7 17.821 4.9731 2.8 19.199 4.6191 5.8 19.46 4.5577 11 19.9114.4554 18.9 20.779 4.2713 9.7 21.115 4.2041 16.8 21.589 4.1129 11 22.0424.0293 26.2 22.477 3.9523 21.8 23.066 3.8528 4 23.487 3.7846 9 23.9573.7115 6.6 24.511 3.6288 3.8 24.98 3.5617 2.2 25.279 3.5202 6.8 25.6333.4724 5.3 26.243 3.393 9.3 26.58 3.3507 10.1 27.903 3.1949 5.2 28.4353.1362 3.8 28.692 3.1088 5 28.948 3.0818 6.6 29.385 3.037 3.7 30.112.9655 4.2 30.976 2.8845 1 31.374 2.8489 1.4 31.727 2.8179 2.7 32.0072.7939 2.2 32.419 2.7594 2.1

Example 2

Example 1 was repeated except that the reaction mixture was prepared inthe following ratios (molar ratios):

SiO₂/GeO₂=4

Template agent/SiO₂=0.60

F/SiO₂=0.60

H₂O/SiO₂=10

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for aging in a 80° C. water bath for 3 hours, and thencrystallizing at 165° C. for 4 days under stirring.

The XRD spectrum data for the product (in the prepared form) was shownin Table 2, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=4.2.

TABLE 2 2 θ/° d/Å I/I₀ × 100 4.817 18.33 2.3 6.578 13.4255 60.6 6.87312.8496 32.1 8.292 10.6542 12.3 9.674 9.1353 76.2 9.889 8.9367 10010.295 8.5851 1.3 11.898 7.4319 1.1 13.128 6.7384 4.4 13.52 6.544 214.224 6.2217 2.2 15.612 5.6713 9.9 16.083 5.5064 1.2 16.521 5.3614 616.912 5.2383 9.8 17.88 4.9567 2.2 19.163 4.6277 5.1 19.44 4.5624 10.219.873 4.4639 17.6 20.76 4.2751 10 21.096 4.2078 18.9 21.569 4.1166 9.422.023 4.0327 28.2 22.495 3.9491 22.7 23.011 3.8618 3.4 23.485 3.78499.5 23.937 3.7144 6.5 24.505 3.6296 4.2 25.276 3.5207 6.9 25.631 3.47265.5 26.245 3.3929 7.2 26.543 3.3554 10.2 27.918 3.1931 5.1 28.418 3.13813 28.671 3.111 5.1 28.91 3.0858 5.2 29.381 3.0374 3.3 30.09 2.9674 4.330.979 2.8842 1.5 31.71 2.8194 2.5 31.984 2.7959 1.9 32.576 2.7464 233.326 2.6863 2.1 34.786 2.5768 2.3 35.219 2.5461 3 35.834 2.5038 2.7

Example 3

Example 1 was repeated except that the reaction mixture was prepared inthe following ratios (molar ratios):

SiO₂/GeO₂=4

Template agent/SiO₂=0.66

F/SiO₂=0.66

H₂O/SiO₂-8

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for crystallizing at 170° C. for 5 days under stirring.

The XRD spectrum data for the product (in the prepared form) was shownin Table 3, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=4.4.

TABLE 3 2 θ/° d/Å I/I₀ 100 4.739 18.6329 2.1 6.516 13.5541 85.9 6.8112.9693 38 8.23 10.7341 20 9.579 9.225 74.3 9.811 9.0075 100 10.2288.6416 5 11.618 7.6103 0.9 13.167 6.7185 5.7 14.147 6.2553 2.3 15.5335.7 26.8 16.003 5.5338 2 16.441 5.3871 6.5 16.832 5.2629 9.8 17.7035.0059 4.8 19.084 4.6466 5.2 19.358 4.5814 10.5 19.794 4.4816 21.520.664 4.2948 16.1 21.017 4.2235 21.5 21.492 4.1312 16.6 21.944 4.047132.3 22.34 3.9762 23.4 22.932 3.875 5.2 23.404 3.7978 10.5 23.838 3.729610.7 24.41 3.6435 7.5 24.908 3.5719 3.1 25.178 3.5341 7.2 25.674 3.466910.3 26.106 3.4105 18.9 26.462 3.3655 14.2 26.913 3.3101 1.3 27.8233.2039 7.3 28.554 3.1234 6.7 28.867 3.0903 10.7 29.28 3.0476 3.3 29.9732.9787 4.8 30.935 2.8883 1.3 31.606 2.8285 3.4 31.905 2.8027 2 32.322.7676 2 33.209 2.6955 2.4 34.076 2.6289 1.5 34.707 2.5825 2.5 35.162.5503 3.4 35.655 2.516 6.4 37.056 2.424 0.5 37.906 2.3716 1.4 38.2382.3518 1.1 38.853 2.3159 1.7 39.442 2.2827 3.9 40.407 2.2304 2.5 41.7912.1597 1.7 42.38 2.131 1.6 44.236 2.0458 1.3 44.669 2.027 1.2 45.1062.0084 2.1 46.464 1.9527 2.6 46.76 1.9411 2.7 48.103 1.89 0.8 48.571.8729 0.5 49.149 1.8522 1.7 49.759 1.8309 3.1 51.144 1.7845 1.4 51.8141.763 0.8 53.489 1.7117 0.8

Example 4

Example 1 was repeated except that the reaction mixture was prepared inthe following ratios (molar ratios):

SiO₂/GeO₂=5

Template agent/SiO₂=0.60

F/SiO₂=0.60

H₂O/SiO₂=12

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for crystallizing at 150° C. for 5 days under stirring.

The XRD spectrum data for the product (in the prepared form) was shownin Table 4, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=5.3.

TABLE 4 2 θ/° d/Å I/I₀ 100 4.901 18.0158 1.2 6.712 13.1586 100 7.00712.6053 24.3 8.372 10.552 37.9 9.797 9.0205 42.8 10.026 8.8154 63.710.421 8.4815 5.4 11.761 7.5182 1.3 13.399 6.6027 7.7 13.657 6.4786 6.114.382 6.1533 1.5 15.729 5.6293 20.1 16.208 5.464 1.8 16.698 5.3049 617.055 5.1947 9.8 18.038 4.9137 6.1 19.324 4.5894 6.5 19.634 4.5178 9.520.068 4.4211 24.8 20.859 4.255 11.6 21.391 4.1504 26.8 21.726 4.087233.5 22.182 4.0042 26.6 22.597 3.9317 17.8 23.191 3.8323 6 23.68 3.75429.6 24.015 3.7025 7.1 24.668 3.606 4.9 25.039 3.5535 4.9 25.417 3.50148.9 25.791 3.4514 10.6 26.323 3.383 3.1 26.835 3.3195 9.4 27.21 3.27462.3 28.097 3.1732 6.1 28.77 3.1005 6.7 29.047 3.0716 12.5 29.612 3.01433.6 30.249 2.9522 4.2 31.49 2.8386 3.6 31.892 2.8038 2.2 32.167 2.78042.1 32.619 2.7429 3.3 33.522 2.671 2.6 35.075 2.5562 1.5 35.733 2.51077.5 36.047 2.4895 3.9 36.566 2.4554 1.5 37.908 2.3715 1.1 38.276 2.34951.8 38.538 2.3341 1.1 39.224 2.2949 1.5 39.797 2.2631 3.1 40.701 2.21493.4 42.047 2.1471 1.5 42.759 2.113 1.3 43.965 2.0578 1.4 44.474 2.03542.1 45 2.0128 1.3 45.462 1.9935 1.5 46.78 1.9403 3.8 47.037 1.9303 448.342 1.8812 1.3 49.547 1.8383 1

Example 5

Example 1 was repeated except that the reaction mixture was prepared inthe following ratios (molar ratios):

SiO₂/GeO₂=3.5

Template agent/SiO₂=0.72

F/SiO₂=0.72

H₂O/SiO₂=9

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for crystallizing at 150° C. for 5 days under stirring.

The XRD spectrum data for the product (in the prepared form) was shownin Table 5, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=3.9.

TABLE 5 2 θ/° d/Å I/I₀ 100 4.741 18.6215 1.6 6.555 13.4725 100 6.83312.9252 25.3 8.234 10.7291 29.7 9.638 9.169 49.7 9.87 8.954 80.7 10.2628.6126 6 13.186 6.7089 4.9 13.501 6.5531 4.1 14.207 6.2287 1.6 15.5725.6859 12 16.578 5.3431 6.4 16.894 5.2436 6.9 17.822 4.9729 3 18.8264.7098 2.4 19.221 4.6138 4.2 19.494 4.5497 6.4 19.894 4.4592 21.2 20.724.2833 10.9 21.45 4.1391 22.9 22.023 4.0328 19.3 22.44 3.9587 14.423.089 3.849 4.3 23.524 3.7788 12.9 23.914 3.718 3.3 24.454 3.6371 2.224.894 3.5737 1.6 25.242 3.5253 5 25.618 3.4744 6.9 26.208 3.3975 2.626.679 3.3386 9.8 27.96 3.1885 3 28.592 3.1194 6.8 28.907 3.0861 6.429.48 3.0274 2 30.346 2.9429 3 31.331 2.8526 1.7 31.734 2.8174 1.732.004 2.7942 1.3 32.46 2.756 2 33.404 2.6803 2.1 34.876 2.5704 0.935.319 2.5392 2.5 35.635 2.5174 3.6 35.968 2.4948 2.3 37.329 2.4069 138.334 2.3461 1.5 39.093 2.3023 1.2 39.596 2.2742 2.3 40.565 2.2221 2.442.559 2.1224 1.2 43.865 2.0623 0.9 44.312 2.0425 1.3 44.948 2.015 145.357 1.9978 0.9

Example 6

Example 1 was repeated, except that boric acid was added into the systemas a boron source to replace a part of the germanium source, and thereplacement ratio was 1%.

The XRD spectrum data for the product (in the prepared form) was shownin Table 6, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=5.4 andSiO₂/B₂O₃=991.3.

TABLE 6 2 θ/° d/Å I/I₀ 100 4.822 18.3094 2.3 6.613 13.3545 100 6.89212.8156 25.3 8.312 10.6289 29.4 9.678 9.1317 50 9.911 8.9171 80.2 10.3228.5629 8.7 11.193 7.8986 0.7 11.629 7.6033 0.9 13.283 6.6601 6.8 13.526.544 4.3 14.233 6.2178 1.6 15.63 5.6647 21.3 16.085 5.5056 2.1 16.5985.3366 5.1 16.916 5.2371 6.9 17.939 4.9405 4.8 19.239 4.6097 3 19.4974.5491 7.2 19.933 4.4506 20.4 20.777 4.2716 14.4 21.214 4.1846 17.221.626 4.1058 24.8 22.043 4.0292 21.4 22.459 3.9554 16.5 23.167 3.83614.6 23.561 3.7729 11 23.915 3.7178 7.2 24.527 3.6264 3.8 25.005 3.55813.9 25.297 3.5178 6.8 25.789 3.4517 8.7 26.243 3.3931 4.8 26.64 3.34335.6 27.921 3.1929 3.3 28.613 3.1172 6.3 28.948 3.0819 8.8 29.46 3.02952.1 30.074 2.969 3 31.374 2.8488 2.9 31.783 2.8132 2.6 32.119 2.7845 1.732.537 2.7496 2 33.386 2.6816 1.8 35.278 2.542 2.7 35.715 2.5119 4.738.158 2.3565 1.3 39.105 2.3016 1.1 39.661 2.2706 2.8 40.605 2.22 2.242.638 2.1187 1.2 43.787 2.0657 0.9 44.294 2.0433 1.5 44.874 2.0182 1.245.419 1.9952 1.5 46.9 1.9356 2.9 48.306 1.8825 1 48.7 1.8682 0.8

Example 7

Example 1 was repeated, except that tetrabutyl titanate was added intothe system as a titanium source to replace a part of the germaniumsource, and the replacement ratio was 2%.

The XRD spectrum data for the product (in the prepared form) was shownin Table 7, and the XRD spectrum was similar to that of FIG. 1.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=5.2 andSiO₂/TiO₂=197.2.

TABLE 7 2 θ/° d/Å I/I₀ 100 4.831 18.27649 4 6.5962 13.38897 63 6.891412.81609 32.05 8.2366 10.72574 12.95 9.6938 9.11644 76.65 9.895 8.931518100 10.2992 8.581884 1.15 11.8934 7.435085 1.15 13.1506 6.726979 4.413.5038 6.551815 2.2 14.219 6.223833 2.25 15.6172 5.669621 9.15 16.08845.504613 1.3 16.5456 5.353521 6.1 16.9358 5.231045 9.75 17.826 4.9717712.5 19.2042 4.617964 5.45 19.4654 4.556583 10.6 19.9166 4.454362 18.2520.7848 4.270113 9.85 21.121 4.202895 17.85 21.5952 4.111665 10.222.0484 4.028164 27.2 22.4836 3.951168 22.25 23.068 3.852375 3.7 23.48923.78424 9.25 23.9594 3.711028 6.55 24.5136 3.62837 4 24.9828 3.5612794.55 25.282 3.519807 6.15 25.6362 3.471973 5.3 26.245 3.392799 8.2526.5822 3.350521 10.15 27.9054 3.194581 5.15 28.4376 3.135994 3.428.6948 3.108467 5.05 28.951 3.081539 5.9 29.3882 3.036683 3.5 30.11342.965184 4.25 30.9796 2.884222 1.25 31.3778 2.848522 1.95 31.7312.817616 2.3 32.0112 2.793589 2.1 32.4234 2.759009 2.1 33.3326 2.6858012.2 34.1988 2.61973 1.3 34.83 2.573686 1.6 35.2462 2.544242 3.15 35.87442.501117 2.9 38.0476 2.363106 1.2 39.0508 2.304677 1.2 39.528 2.2779462.8 40.5332 2.223744 2.15 42.4654 2.126925 1.05 43.683 2.070421 0.9544.3132 2.042428 0.8 44.7354 2.024128 1.2 45.3056 1.999969 1.7 46.56581.948737 2 46.922 1.93477 1.25 49.2602 1.848265 0.7

Example 8

Example 1 was repeated except that the reaction mixture was prepared inthe following ratios (molar ratios):

SiO₂/GeO₂=4

Template agent/SiO₂=0.9

F/SiO₂=0.9

H₂O/SiO₂=11

After being mixed uniformly, the mixture was loaded into a stainlesssteel reactor for crystallizing at 170° C. for 6 days under stirring.

The XRD spectrum data of the product (in the prepared form) was shown inTable 8, and the XRD spectrum was shown in FIG. 2.

The product molecular sieve was measured by inductively coupled plasmaatomic emission spectroscopy (ICP) to have a SiO₂/GeO₂=4.2.

TABLE 8 2 θ/° d/Å I/I₀ 100 4.741 18.6215 1.6 6.555 13.4725 100 6.83312.9252 25.3 8.234 10.7291 29.7 9.638 9.169 49.7 9.87 8.954 80.7 13.1866.7089 4.9 13.501 6.5531 4.1 14.207 6.2287 1.6 15.572 5.6859 12 16.5785.3431 6.4 16.894 5.2436 6.9 17.822 4.9729 3 18.826 4.7098 2.4 19.2214.6138 4.2 19.494 4.5497 6.4 19.894 4.4592 21.2 20.72 4.2833 10.9 21.454.1391 22.9 22.023 4.0328 19.3 22.44 3.9587 14.4 23.089 3.849 4.3 23.5243.7788 12.9 23.914 3.718 3.3 24.454 3.6371 2.2 24.894 3.5737 1.6 25.2423.5253 5 25.618 3.4744 6.9 26.208 3.3975 2.6 26.679 3.3386 9.8 27.963.1885 3 28.592 3.1194 6.8 28.907 3.0861 6.4 29.48 3.0274 2 30.3462.9429 3 31.331 2.8526 1.7 31.734 2.8174 1.7 32.004 2.7942 1.3 32.462.756 2 33.404 2.6803 2.1 34.876 2.5704 0.9 35.319 2.5392 2.5 35.6352.5174 3.6 35.968 2.4948 2.3

The product was calcined at 550° C. for 6 hours in the air atmosphere,and the XRD spectrum of the obtained sample (in the calcined form) wasshown in FIG. 3, and the spectrum data was shown in Table 9. Thecalcined sample had a specific surface area (BET method) of 337.4 m²/gand a micropore volume (t-plot method) of 0.14 cm³/g, as measured bynitrogen desorption.

TABLE 9 2 θ/° d/Å I/I₀ 100 4.816 18.3323 2.2 6.604 13.3741 100 6.96512.6807 34.7 8.39 10.5297 30.9 9.682 9.1272 29.7 9.976 8.859 50.8 13.2496.6769 6.6 14.22 6.2232 7.5 15.124 5.8531 6.1 15.554 5.6923 18.5 17.265.1334 2.3 17.908 4.9492 3.8 19.487 4.5515 3.7 19.966 4.4433 9.2 20.2034.3917 8 20.574 4.3135 6.5 21.174 4.1924 7.1 21.735 4.0855 21.5 22.243.9939 11.8 22.408 3.9643 11.4 23.748 3.7435 6.9 25.221 3.5282 6.425.681 3.466 11.5 26.224 3.3955 3.8 26.683 3.3381 4.7 27.12 3.2852 3.228.786 3.0988 7.3 30.163 2.9604 2.9 31.189 2.8654 2.6 32.237 2.7746 3.535.543 2.5237 4.9 36.185 2.4804 2 38.257 2.3506 1.8 46.871 1.9367 1.7

Example 9

The calcined molecular sieve obtained in example 8 and 0.7 wt % Al(NO)₃solution were loaded into a three-neck flask at a weight ratio ofmolecular sieve:Al(NO₃)₃ solution=1:50. Reaction was conducted for 6hours in an oil bath at 80° C. under stirring. The solid sample wascentrifuged and washed after reaction, and was put into an oven at 100°C. for overnight drying. The dried sample was then reacted with an 0.01mol/L of HCl solution at a weight ratio of molecular sieve:HClsolution=1:50 at room temperature for 6 hours under stirring. The solidsample was centrifuged and washed after the reaction, and was dried inan oven at 100° C. overnight to obtain a powder. The product wasmeasured by inductively coupled plasma atomic emission spectroscopy(ICP) to have a SiO₂/GeO₂=5.8 and a SiO₂/Al₂O₃=112.5.

Example 10

3 g of the powder sample prepared in example 9 was mixed with 2 g ofalumina and 0.3 g of sesbania powder, kneaded with 5 wt % of nitricacid, extruded into a rod of φ1.6*2 mm, and then dried at 110° C. andcalcined at 550° C. for 6 hours in an air atmosphere to remove organicsubstances, so as to prepare a desired molecular sieve composition. Themolecular sieve composition could be used as an adsorbent or a catalyst.

Example 11

The molecular sieve composition prepared in the example 10 was crushedand sieved. 30 mg of particles having a particle size of 20-40 mesheswas loaded into a pulse fixed bed reactor, activated for 1 h in anitrogen atmosphere at 300° C., and cooled to the reaction temperatureof 250° C. A pulse sample injection mode was adopted to inject 0.4microliter of cumene into the reactor instantly at one time. The cumenewas subjected to a cracking reaction through a molecular sievecomposition bed layer. The mixture after the reaction was directly fedinto a gas chromatography for analysis. The conversion rate of thecumene was 33.7%, and main products were propylene and benzene.

1. A molecular sieve SCM-15, characterized in that the molecular sieve,particularly in its prepared form or calcined form, has an X-raydiffraction spectrum substantially as shown in Table A-1 or Table A-2below, TABLE A-1 2θ (°)^((a)) d-distance (Å)^((b)) Relative intensity(I/I₀ × 100) 4.811 18.353 w 6.571 13.441 m-vs 6.888 12.823 m-s 9.6759.134 m-vs 9.894 8.933 m-vs 19.888 4.461 w-m ^((a))= ±0.3°, ^((b))is afunction of 2θ,

TABLE A-2 2θ (°)^((a)) d-distance (Å) Relative intensity (I/I₀ × 100)4.811 18.424 ± 1.148 w 6.571 13.468 ± 0.614 m-vs 6.888 12.847 ± 0.559m-s 9.675  9.143 ± 0.283 m-vs 9.894  8.941 ± 0.270 m-vs 19.888  4.462 ±0.067 w-m (a)= ±0.3°.


2. The molecular sieve SCM-15 according to claim 1, characterized inthat the X-ray diffraction spectrum further comprises X-ray diffractionpeaks substantially as shown in Table B-1 or Table B-2 below, TABLE B-12θ (°)^((a)) d-distance (Å)^((b)) Relative intensity (I/I₀ × 100) 8.22510.741 w 15.592 5.679 w 22.031 4.031 w-m 22.435 3.960 w-m 25.330 3.513 w^((a))= ±0.3°, ^((b))is a function of 2θ,

TABLE B-2 2θ (°)^((a)) d-distance (Å) Relative intensity (I/I₀ × 100)8.225 10.755 ± 0.392  w 15.592 5.681 ± 0.109 w 22.031 4.032 ± 0.054 w-m22.435 3.960 ± 0.052 w-m 25.330 3.514 ± 0.041 w ^((a))= ±0.3°,

said X-ray diffraction spectrum optionally further comprising X-raydiffraction peaks substantially as shown in the table below, 2θ(°)^((a)) d-distance (Å) Relative intensity (I/I₀ × 100) 14.294 6.194 ±0.129  w 16.909 5.241 ± 0.0.092 w 19.156 4.630 ± 0.0.072 w-m 19.5174.546 ± 0.0.069 w-m 21.162 4.196 ± 0.0.059 w-m ^((a))= ±0.3°.


3. The molecular sieve SCM-15 according to claim 1, characterized inthat the molecular sieve has a schematic chemical composition of formula“SiO₂.GeO₂”, wherein the molar ratio of silicon to germanium satisfiesSiO₂/GeO₂≥1, preferably 1≤SiO₂/GeO₂≤15, more preferably 2≤SiO₂/GeO₂≤10,or more preferably 2.5≤SiO₂/GeO₂≤5.
 4. The molecular sieve SCM-15according to claim 3, characterized in that not more than 10% of the Geatoms in the molecular sieve are substituted by atoms of at least oneelement other than silicon and germanium.
 5. The molecular sieve SCM-15according to claim 4, characterized in that the element other thansilicon and germanium is at least one selected from the group consistingof boron, aluminum, tin, zirconium and titanium.
 6. A process ofpreparing molecular sieve SCM-15, comprising a step of crystallizing amixture comprising a silicon source, a germanium source, a fluorinesource, an organic template and water or consisting of a silicon source,a germanium source, a fluorine source, an organic template and water, toobtain the molecular sieve, wherein the organic template is selectedfrom 4-pyrrolidinylpyridine, or a quaternary ammonium form representedby formula (A-1), formula (A-2) or formula (A-3), preferably4-pyrrolidinylpyridine,

in each formula, R₁ and R₂ are each independently H or C₁₋₈ alkyl,preferably C₁₋₄ alkyl, more preferably C₁₋₂ alkyl, and X⁻ are eachindependently a halogen ion (such as Cl⁻, Br⁻, and I⁻) and a hydroxideion (OH⁻), preferably hydroxide ion (OH⁻).
 7. The process of preparingmolecular sieve SCM-15 according to claim 6, characterized in that thesilicon source is at least one selected from the group consisting ofsilicic acid, silica gel, silica sol, tetraalkyl orthosilicate and waterglass; the germanium source is at least one selected from the groupconsisting of germanium oxide, germanium nitrate andtetraalkoxygermanium; and the molar ratio of the silicon source(calculated by SiO₂), the germanium source (calculated by GeO₂), thefluorine source (calculated by F), the organic template agent and wateris 1:(0-1):(0.1-2.0): (0.1-2.0):(3-30); preferably 1:(1/15-1.5):(0.2-1.5):(0.2-1.5):(4-25); more preferably1:(0.1-0.5):(0.4-1.2):(0.4-1.2):(5-20); more preferably1:(0.2-0.4):(0.6-1.0):(0.6-1.0):(5-15).
 8. The process of preparingmolecular sieve SCM-15 according to claim 6, characterized in that thecrystallization conditions comprise: a crystallization temperature of131 to 210° C., preferably 150 to 190° C., more preferably 160 to 180°C.; and a crystallization duration of 1 to 20 days, preferably 2 to 10days, more preferably 2 to 7 days.
 9. The process of preparing molecularsieve SCM-15 according to claim 6, characterized in that the processcomprises an aging step prior to crystallization; and the agingconditions include: an ageing temperature of 50-90° C., and an ageingduration of 2 hours to 2 days.
 10. The process of preparing molecularsieve SCM-15 according to claim 6, characterized in that the mixturefurther comprises a source of an element other than silicon andgermanium, preferably at least one selected from the group consisting ofboron source, aluminum source, tin source, zirconium source and titaniumsource; more preferably at least one oxide source selected from thegroup consisting of a boron oxide source, an alumina source, a tin oxidesource, a zirconium oxide source and a titanium oxide source; and themolar ratio of the oxide source (calculated as the corresponding oxide)to the germanium source (calculated as GeO₂) is (0.01-0.1):1, preferably(0.02-0.08):1.
 11. A molecular sieve composition, comprising themolecular sieve SCM-15 according to claim 1 and a binder.
 12. Use of themolecular sieve SCM-15 according to claim 1 as an adsorbent or catalyst.13. A molecular sieve composition, comprising the molecular sieve SCM-15prepared according to the process of preparing the molecular sieveSCM-15 according to claim 6 and a binder.
 14. Use of the molecular sieveSCM-15 prepared according to the process of preparing the molecularsieve SCM-15 according to claim 6 as an adsorbent or catalyst.
 15. Useof the molecular sieve composition according to claim 11, as anadsorbent or catalyst.